In September of 2151, temporal agentDaniels claimed he and a fictional brother of his grew up in Illinois as part of his cover story. In reality, Daniels came from a place called "Illinois," which he said was very different than the Illinois of 2151. (ENT: "Cold Front")

Illinois was named on a map of the United States (Die Vereinigten Staaten von Amerika).

The contours of this state were seen on a map of the United States in "Little Green Men".